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We present optical measurements of the transition metal dichalcogenidePdTe$_{2}$. The reflectivity displays an unusual temperature and energydependence in the far-infrared, which we show can only be explained by acollapse of the scattering rate at low temperature, resulting from the vicinityof a van Hove singularity near the Fermi energy. An analysis of the opticalconductivity suggests that below 150 K a reduction in the available phase spacefor scattering takes place, resulting in long-lived quasiparticle excitations.We suggest that this reduction in phase space provides experimental evidencefor a van Hove singularity close to the Fermi level. Our data furthermoreindicates a very weak electron-phonon coupling. Combined this suggests that thesuperconducting transition temperature is set by the density of statesassociated with the van Hove singularity.

Scattering rate collapse driven by a van Hove singularity in the Dirac semi-metal PdTe$_{2}$